Machining head for a gear cutting machine and method for toothing a workpiece, in particular a worm shaft or toothed rack

Abstract

The present disclosure relates to a machining head for a gear cutting machine, in particular a hobbing or hob grinding machine, for toothing a workpiece, in particular a worm shaft or a toothed rack, wherein the machining head comprises at least two tool spindles arranged one beside the other.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims priority to German Patent Application No. 10 2015 002 362.4, entitled “Machining Head for a Gear Cutting Machine and Method for Toothing a Workpiece, in Particular a Worm Shaft or Toothed Rack,” filed on Feb. 26, 2015, the entire contents of which is hereby incorporated by reference in its entirety for all purposes.TECHNICAL FIELD[0002]This present disclosure relates to a machining head for a gear cutting machine, in particular a hobbing or hob grinding machine, for toothing a workpiece, in particular a worm shaft or a toothed rack.BACKGROUND AND SUMMARY[0003]A toothed rack is a vertically mounted technical device with teeth and mostly is used within a rack-and-pinion drive.[0004]Worm gear units are screw rolling gear units which consist of a pairing of a worm (worm shaft) and a helically toothed worm gear meshing therein. In most applications, the axes of worm shaft and worm gear are at right angles to each other. ...

AI Technical Summary

Benefits of technology

The present invention proposes a machining head for a gear cutting machine that allows for improved tooth-machining of workpieces. The machining head has at least two tool spindles arranged one beside the other for accommodating corresponding tools. This division of tools provides advantages in workpieces of great overall length, as it allows for additional fixation at the tip of the workpiece and increases the stability of the workpiece. As a result, the machining quality is improved, the workpiece can be accommodated more stably, and larger advances or feed rates can be realized, reducing machining time. The workpiece can be clamped longitudinally, and the division of moments can be achieved using separate motors or an interposed transfer gear. The machining head can be guided and shifted within the gear cutting machine, allowing for stable and quality-preserving machining. After the machining head is mounted with side milling cutters, a roughing and finishing step can be carried out with the two milling cutters in one machining step for adjacent tooth gaps. The position of the tools relative to each other can be adjusted via special tool holders.

Problems solved by technology

Due to the function-related relative movements in screw rolling gear units, a sliding movement takes place above all between the flanks of worm and worm gear, so that worm gear units have a low efficiency at high gear ratios at the same time.

Further methods include the hob peeling or whirling of worms, wherein the disadvantage of these methods is to be seen in the expensive special tools adjusted especially to the workpiece to be manufactured.

A serious disadvantage of this embodiment consists in that because of impending collisions the worm 5 cannot accommodate in its center via a tip.

Especially with small tool diameters and long worms 5 the tool mandrel 3 can become quite thin, which has a disadvantageous effect on the stability.

However, when tools with large diameter are used, an offset arrangement on the spindles extending in parallel possibly can be expedient, as otherwise the large diameters and the possibly overlapping working radii can lead to a collision of the two tools.

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